Fire-box construction



May 28, 1929.

F. BRAUN FIRE BOX CONSTRUCTION Filed Oct. 13. 1927 HIH gwventoz Patented May 28, 1929 new UNITED s'TATESgPATENr OFFICE.

HERMAN r. BRAUN, or cnnvnneiin, oH Io, AssIqNoR 'ro CLEVELAND STEEL PROD-' Uc'rs CORPORATION, excremen omo, A" coaroaa'rron or 0310.

TIRE-BOX, eoNsrRoc'rroN.

Application filed October 13, 1927. Serial No.- 225,878.

This invention relates generally tofliousehold furnaces and more particularly to a.

novel and improved firesbox construction which is especlally designed for use in con.- nection with furnaces of the type' 111 whichfuel oil is atomized by arotary atomizin nozzle and delivered to the furnace an lburned adjacent the periphery of the fire- One of the main objects of the invention. is to provide a novel and efficient firebox construction for use with rotary oil burner units of the character referred to and in which the combustion takes place at a point spaced from the burner unit and in the shape of an annular ring about the peripheral wall of the firebox.

Another object of the invention is to generally improve the efliciency of heating units of this character and to provide for a thorough and efficient mixture of atomized fuel and air.

A further object of the invention is to 'in vertical section showing a furnace firebox constructed in accordance with our invention and Fig. 2 is a detail fragmentary vertical sectional view showing a modification.

Referring now to the drawings, the reference character 1 designates the vertical side Walls of the firebox or combustion chamber of the furnace and 2 designates the bottom or base member which is preferably formed of refractory or heat resisting material. The base member. 2 fits within the bottom of the furnace and is provided with a centrally disposed opening 3. Arranged within the opening 3 is a power operated rotary burner unit which consists of hollow casting 4 .which is projected through the opening and is supported by a plurality of adjustable legs 5 so that the height of the same may be adjusted. Carried by the legs 5 is an electric ,motor Gthe shaft of which projects upwardly through casting 4 and has secured thereto a combination oil dis- 'the periphery thereof. The

tapers upwardly from the opening 3 to 'a point slightly below the plane of discharge and is there. provided with an annular upstanding shoulderv 8 which is spaced a slight distance from the member. The perip ery of the base member is provided with an annular upstanding periphery of the base in shapeandthe upper side of the same.

'65. of the fuel, as shown by the arrows in Fig. 1,

peripheral 'flange 9 which projects a slight distance above the plane of discharge of the' fuel. The speed at which the combined distributin head and fan are rotated is so regulated that combustion takes place in the shape of an annular ring about the periph-. ery of the firebox as indicated by the arrows. The fuel is discharged radiallyas indicated by the upper series of arrows and a portion of the air-drawn in by the fan takes the course indicated by the lower series of arrows. Due to the speed of rotation of the combined fan and distributing head and the peculiar shape of the bottom of the firebox the flame is given a whirling or rolling motion which results in a most efficient mixture of air and atomized fuel and an extremely hot flame which is evenly distributedover the entire area of the combustion chamber. I

I do not wish my invention to be limited to any particular form of distributing head as any type of burner unit employing the same general principle may be used as the main feature ofthis invention is the shape of the combustion chamber. r L

In Fig. 2 I have disclosed a slight modification of my invention in-which the bottom of the combustion chamber is tapered outwardly all the way-I to the flange '9 and instead of providing the shoulder 8 as shown in Fig. 1 I provide at this point a ring member 8' which performs the same function as the shoulder 8 hereinbefore referred to.

The ring member 8' may be rigidly securedin place or it may rest loosely in the bottom of the firebox. The advantage of this form l the type disclosed in my copending application hereinbefore referred to and now in general use.

It will now be clear that I have provided a novel firebox construction for furnaces of the character described which will accomplish the objects of my invention as hereinbefore stated. Various changes may be made in the details of construction and in the specific burner unit without departing from the spirit ofmy invention and I wish my. invention to be limited" only in accordance with the scope of the appended claims. Having thus described my invention, what I claim is 1. In a furnace of the character described, the combination of a firebox the bottom of which is formed by a substantially annular member composed principally of refractory material, said b III member having a centrally disposeo opening therein, a power operated fuel and air distributing mechanism arranged within said opening and adapted to discharge the fuel in a horizontal plane, thebottom of the fire box tapering upwardly from said opening to a point slightly below the plane of discharge of fuel and there provided with a substantially annular upstanding shoulder spaced a slight distance from the periphery of said substantially annular member.

2. In a furnace of the character described,

4 the combination of a firebox the bottom of which is formed by a substantially annular member composed principally of refractory material, said bottom member having a centrally disposed opening. therein, a power operated fuel and air distributing mechanism arranged within said opening and adapted to discharge the fuel in a horizontal plane, the bottom of thefirebox tapering upwardly from said opening to a point slightly bc low the plane of discharge of fuel and there provided with a substantially annular upstanding shoulder spaced a slight distance from the periphery of said substantially annular member, said substantially annular member having an upstanding peripheral flange projecting above the plane of discharge of the fuel. I

3. In a furnace of the character described, the combination of a fire box the bottom of which is formed of a substantially annular member composed principally of refractory material and fitting within the fire box, said member having a centrally disposed opening therein, a power operated fuel distributing and atomizing mechanism arranged within said opening, the bottom of the tire box tapering upwardlyfrom said opening and having a substantially annular upstanding shoulder thereon spaced a slight distance from the periphery thereof and below the plane of discharge of fuel and an upstanding peripheral flange extending above and disposed beyond said substantially annular shoulder.

4. In a furnace of the character described the combination with a fire box the bottom of which consists of a base member formed ofheat resisting material and fitting within the fire box, the said base member being substantially annular in shape and having a centrally disposed opening therein adapted to receive a fuel distributing mechanism therethrough, said base member tapering upwardly from said opening and provided adjacent its periphery with an upstanding substantially annular shoulder spaced from'the walls of the fire box and below the plane of discharge of fuel.

5. In a furnace of the character described, the combination with a fire box the bottom of which is formed of a base member composed principally of heat resisting material and fitting within the fire box, said base member being substantially annular in shape and having -a centrally disposed opening therein adapted to receive afuel distributing mechanism therethrough, said base member tapering upwardly from said opening and having an upstanding substantially annular shoulder thereon spaced from theperipheral edge thereof and below the plane of discharge of the fuel.

6. A fire box for furnaces of the character set forth comprising a base memberx'omposed principally of heat resisting material and forming the bottom of the furnace and having a centrally disposed opening therein adapted to receive a burner unit therethrough, said base member being substantially annular in shape and having a substantially, annular peripheral flange disposed adjacent the walls of the fire box and a substantially ,annular shoulder spaced from" said peripheral flange and below the plane of discharge of fuel, that portion of said base member between said shoulder and opening tapering downwardly toward said opening. a

7. A fire box for furnaces of the character described comprising a base member composed principally of refractory material and forming the bottom of the firebox and having an opening in its bottom adapted to re ceive a burner unit therethrough, the said bottom tapering-upwardly from said openmg and formed adjacent its'periphery with a substantially annular shoulder and a horizontally disposed portion, the said horizontally disposed portion being disposed a slight distance below the upper edge 0f.said base member and below the plane of discharge of fuel.

8. In a fire box for furnaces of the character described, a base member forming the bottom of the fire box, said base member havmga centrally disposed opening adapted to receive a burner unit therethrough, said bottom tapering upwardly from said opening and having an upstanding peripheral flange disposed adjacent the sidewalls of the fire box and an upstanding substantially annular shoulder spaced from and slightly below said peripheral flange and below the plane of discharge of fuel.

9. In a furnace construction of the character described, a firebox, the bottom of which is formed of a member composed principally of heat resisting material, said bottom member having a centrally disposed opening therein adapted to receive a rotary fuel and air distributing member, the said bottom member tapering upwardly and out-' wardly from'said opening and having means disposed adjacent the periphery thereof and so disposed with respect to the plane of discharge of fuel and air as to impart a Whirling motion to the flame.

10. In a furnace construction of the character described, a fire box, the bottom of which is formed of a member composed principally of heat resisting material, said bottom member having a centrally disposed opening therein adapted to recelve a rotary fuel and air distributing member therethrough, the said bottom member tapering upwardly and outwardly from said opening, the peripheral portion thereof being so shaped and disposed with respect to the plane of discharge of fuel and air as to inipart a whirling motion to the flame.

In testimony whereof, I hereunto afiix my signature.

HERMAN F. BRAUN. 

